Kia Stonic (2018)
2018 Kia Stonic
CarHunch analysed 6,789 real MOT records for the 2018 Kia Stonic. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
The 2018 Kia Stonic is a notably reliable choice, with a 90.7% first-time pass rate that beats the UK average of 80% by a clear margin. Petrol versions edge out diesels slightly (91.2% vs 89.1%), and while the 18.7% dangerous defect rate sits just under the concern threshold, it's worth factoring into your decision if buying used.
These cars are running relatively light at 31,600 miles median for their age, suggesting they're generally well looked after. The average of 0.61 failures and 4.5 advisories per test indicates minor wear items are the main culprit rather than structural problems—when shopping, get a full pre-purchase inspection to check brake wear and suspension condition, which typically dominate the advisory list.
Petrol vs Diesel
Pass rate difference of 2 percentage points — worth knowing if you're choosing between the two.
What to check before buying a 2018 Kia Stonic
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Kia Stonic
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Petrol (77%) | 5,232 | 91.2% | 0.58 |
| Diesel (23%) | 1,557 | 89.2% | 0.72 |
Mileage Distribution
Most 2018 Kia Stonic vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2018 Kia Stonic vehicles fall between 23,734 and 40,859 miles.
2018 Kia Stonic — Still on the Road
Strong survival — 6,572 vehicles still getting MOTs in 2025, 99% of the peak.
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2021–2025.
MOT History Averages
Most Common MOT Issues — 2018 Kia Stonic
Based on actual MOT test records for this model. Percentage shows how often each item appears across all vehicles in this cohort.
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38.9%
Nearside Front Tyre worn close to legal limit/worn on edge
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36.7%
Offside Front Tyre worn close to legal limit/worn on edge
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32.6%
Front Brake pad(s) wearing thin
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17.9%
Nearside Rear Tyre worn close to legal limit/worn on edge
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15.3%
Offside Rear Tyre worn close to legal limit/worn on edge
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14.3%
Rear Brake pad(s) wearing thin
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13.2%
Offside Rear Brake disc worn, pitted or scored, but not seriously weakened
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12.7%
Nearside Rear Child Seat fitted not allowing full inspection of adult belt ()
Data covers a 3-year window centred on 2018. Counts include advisories and failures.
Found a specific Kia Stonic?
Enter the reg to see its individual MOT history, AI Hunches, and how it compares to this cohort.